The java implementation reads the contents of the txt file

Let's look at an example first

import java.io.*;
 
/**
* Created by liguoqing on 2016/3/28.
*/
public class ReadTxtFile {
 
 
public static void readTxt(String filePath) {
 
  try {
    File file = new File(filePath);
    if(file.isFile() && file.exists()) {
      InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "utf-8");
      BufferedReader br = new BufferedReader(isr);
      String lineTxt = null;
      while ((lineTxt = br.readLine()) != null) {
        System.out.println(lineTxt);
      }
      br.close();
    } else {
      System.out.println(" File does not exist !");
    }
  } catch (Exception e) {
    System.out.println(" File reading error !");
  }
 
  }
 
 
  public static void main(String[] args) {
    String filePath = "D:\\test\\ I .txt";
    readTxt(filePath);
  }
 
}

After looking at the above example, let's examine it in more detail

java reads the contents of the txt file. It can be understood as follows:

First, get a file handle. File file = new File(); file is the file handle. The two men connected to the telephone network. Now you can start making phone calls.

Read party a's information via this line: new FileInputStream(file) this information has been read into memory at present. Next, it shall be interpreted into something that can be understood by party b

Now that you're using FileInputStream(). Then the corresponding method needs to use InputStreamReader() to interpret the data just loaded into memory

When the reading is done, output it. That, of course, translates into data that IO can recognize. That calls the bytecode reading method BufferedReader(). Each row in the txt file is read using the readline() method of bufferedReader().

package com.campu; 
 
import java.io.BufferedInputStream; 
import java.io.BufferedReader; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.InputStreamReader; 
import java.io.Reader; 
 
/** 
 * @author  Code farmers jiang  
 * H20121012.java 
 * 2012-10-12 In the afternoon 11:40:21 
 */ 
public class H20121012 { 
  /** 
   *  Function: Java read txt Content of file  
   *  Steps: 1 : get the file handle first  
   * 2 : gets the file handle as input 1 The input stream needs to be read  
   * 3 : after reading the input stream, the generated byte stream needs to be read  
   * 4 : 1 line 1 Line output. readline() .  
   *  Note: exceptions should be considered  
   * @param filePath 
   */ 
  public static void readTxtFile(String filePath){ 
    try { 
        String encoding="GBK"; 
        File file=new File(filePath); 
        if(file.isFile() && file.exists()){ // Determine if the file exists  
          InputStreamReader read = new InputStreamReader( 
          new FileInputStream(file),encoding);// Consider the encoding format  
          BufferedReader bufferedReader = new BufferedReader(read); 
          String lineTxt = null; 
          while((lineTxt = bufferedReader.readLine()) != null){ 
            System.out.println(lineTxt); 
          } 
          read.close(); 
    }else{ 
      System.out.println(" The specified file could not be found "); 
    } 
    } catch (Exception e) { 
      System.out.println(" Error reading file contents "); 
      e.printStackTrace(); 
    } 
   
  } 
   
  public static void main(String argv[]){ 
    String filePath = "L:\\Apache\\htdocs\\res\\20121012.txt"; 
//   "res/"; 
    readTxtFile(filePath); 
  } 

}